Fixed bug on update & changed priority algorithm
Changed date and priority parsing algorithm

only the last "start", "end" and "priority" keywords will be checked
Added parsing for sorting method
Preparing for searching with date
Merge branch 'staging' into ryan/controller

Conflicts:
	src/app/controllers/CommandParser.java
	src/app/helpers/CommandObject.java
Merge pull request #236 from cs2103aug2014-w13-1c/jin/gui

Finish sorting style choice box
Merge pull request #237 from cs2103aug2014-w13-1c/ryan/controller

Changed parsing algorithm, added parsing for sort, preparing keywords for search by dates
Improved the magic words for error messages
Scrolling works for keyboard input and not buttons now.
Fixed the reverted removing dates for update

and tried to parse searching by dates
Added parsing for searching by date
Merge pull request #238 from cs2103aug2014-w13-1c/ryan/controller

Fixed removing dates via update and implemented parsing for search by date
Fixed taskcontroller for searching by dates
Changed notification message for update
Merge pull request #239 from cs2103aug2014-w13-1c/ryan/controller

Fixed taskController for search by date (null pointer exception)
Merge branch 'staging' into dat/scrolling
Appropriate titles are now passed to title bar

main window title remains at "wat do"
Centered the title label